> db.test_min_max.find()
{ "_id" : "a_max_key", "a" : { "$maxKey" : 1 } }
{ "_id" : "a_min_key", "a" : { "$minKey" : 1 } }
{ "_id" : "a_null", "a" : null }
{ "_id" : "a_number", "a" : 4 }
{ "_id" : "a_subobject", "a" : { "b" : "hi" } }
{ "_id" : "a_undefined", "a" : undefined }
{ "_id" : "a_string", "a" : "hello" }
> db.test_min_max.find({a: {$gt: MinKey}})
{ "_id" : "a_min_key", "a" : { "$minKey" : 1 } } . // THIS IS WRONG
{ "_id" : "a_undefined", "a" : undefined }
{ "_id" : "a_null", "a" : null }
{ "_id" : "a_number", "a" : 4 }
{ "_id" : "a_string", "a" : "hello" }
{ "_id" : "a_subobject", "a" : { "b" : "hi" } }
{ "_id" : "a_max_key", "a" : { "$maxKey" : 1 } }
> db.test_min_max.find({a: {$gt: MinKey}}).explain()
{
	"queryPlanner" : {
		"plannerVersion" : 1,
		"namespace" : "test.test_min_max",
		"indexFilterSet" : false,
		"parsedQuery" : {
			"a" : {
				"$gt" : { "$minKey" : 1 }
			}
		},
		"winningPlan" : {
			"stage" : "FETCH",
			"inputStage" : {
				"stage" : "IXSCAN",
				"keyPattern" : {
					"a" : 4
				},
				"indexName" : "a_4",
				"isMultiKey" : false,
				"multiKeyPaths" : {
					"a" : [ ]
				},
				"isUnique" : false,
				"isSparse" : false,
				"isPartial" : false,
				"indexVersion" : 2,
				"direction" : "forward",
				"indexBounds" : {
					"a" : [
						"[MinKey, MaxKey]" . // THIS IS WRONG
					]
				}
			}
		},
		"rejectedPlans" : [ ]
	},
	"serverInfo" : {
		"host" : "franklinia",
		"port" : 27017,
		"version" : "0.0.0",
		"gitVersion" : "unknown"
	},
	"ok" : 1
}